Foul by Player Making Throw-in

[Nevadaref]

There was a play in our CA study guide this year that had the defender fouling the thrower during a throw-in, but the thrower had extended his arms and the ball through the boundary plane into the inbounds side. The contact was on the arm of the thrower while attempting to legally steal the ball on the inbounds side of the boundary plane.
The ruling given was a common foul.

I would therefore also call a NONintentional foul on the thrower if he reached inbounds and fouled a defender during the throw-in. If he had not yet released the ball, I have PC, and don't award the bonus. This would be a great question to pose to the NFHS committee for an interpretation though.